yes, BG and other companies do it free in replace of your old boiler, have you tried their websites. They used to advertise but haven't seen them for a while.We get phone calls from them all the time. I think you may have to pay something but it really isn't much.We are low income too, so obviously they know who they need to call.

How old is your boiler? They usually have to be over ten years old. We had one replaced through our council when they doing them for all and sundry and we paid £400 towards it. I realise yours is broken but tbh, if they were offering to replace ours again I wouldn't do it. We had no end of trouble with the replacement although our heating bills did go down. Slightly because gas prices went up. Somehow it always seems to even itself out